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Another thing that I would like to do is to move the data layer from
C++/SQLite to C#/SQL Server Compact

...

that would help with getting new developers in the future.

You bet on this!

If I get a really working sort of bridge between Outlook and a
well-defined C# interface in my hands, I will 100% surely add the second
step from this interface to whatever my customers use. Native Zarafa is
first on my list - hell, just a MySQL database directly on a server
would provide excellent opportunities!

Sorry for not working on the first part - my C[++] skills are really
bad. I implemented a Storage Provider in Pascal, but it never really
worked well.